- remove the Metadata property from AssetBase and return all previous

properties as before
- prefix private variables with m_ in AssetBase.cs
- related to Mantis #3122, as mentioned in
  https://lists.berlios.de/pipermail/opensim-dev/2009-February/005088.html
- all services will likely need to be upgraded after this commit

OpenSim/Framework/AssetLoader/Filesystem/AssetLoaderFileSystem.cs

@@ -145,7 +145,7 @@ namespace OpenSim.Framework.AssetLoader.Filesystem
 
                         AssetBase newAsset = CreateAsset(assetIdStr, name, assetPath, false);
 
-                        newAsset.Metadata.Type = type;
+                        newAsset.Type = type;
                         assets.Add(newAsset);
                     }
                 }